Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1986-10-02
1988-08-23
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 78, G11B 5596
Patent
active
047665084
ABSTRACT:
In a floppy disk drive, the head position is controlled in accordance with prerecorded sets of sinusoidal bursts recorded first on the right side of each track and then on the left side of each track in the narrow separation space between each pair of adjacent disk sectors. The serial bursts are peak detected and then integrated by the same peak detector and the same integrator, the integrals of the right and left bursts being substracted and transmitted to the head tracking servo as a position error signal. The process of peak detecting prior to integration removes the detected wave shape (which changes with track radius) as a factor in the position error computation, thus eliminating dependency of the error computation on the track radius. Using a single channel--the same peak detector and the same integrator--to process both the right and left hand sinusoid bursts eliminates offset errors in the tracking error computation characteristic of dual channel devices.
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Cardillo, Jr. Raymond F.
Eastman Kodak Company
Robertson David L.
Wallace Robert M.
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